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| Farias,Renata S.; Silva,Bruno C. N. R.; Nascimento,Wilka V. G.; Silva,Gênison C.; Luz,Ronald K.; Prosdocimi,Francisco; Figueiredo,Rozzanno A. C. R.; Carvalho,Daniel C.; Coimbra,Maria R. M.. |
| Abstract Due to the ecological importance of Lophiosilurus alexandri, the present work evaluated its genetic representativeness by comparing wild stocks to broodstocks that were kept at three restocking hatcheries along the São Francisco River. A total of 97 samples were genotyped for newly developed microsatellite markers. Low levels of genetic diversity (average alleles number of 4.2 alleles) were detected in all cases, being more severe in captive groups. Significant pairwise FST and DEST values, Structure, and DAPC analyses showed that wild animals were structured in two groups, and a third group was formed by captive animals, evidencing the need to adopt genetic criteria to retain genetic diversity in the hatcheries. For this reason, three full-sib... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lophiosilurus alexandri; Low genetic diversity; Relatedness estimator; Restocking; Sedentary behavior. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300211 |
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| Sant´Ana,Léa S.; Iwamoto,Adriane A.; Crepaldi,Daniel V.; Boaventura,Túlio P.; Teixeira,Lilian V.; Teixeira,Edgar A.; Luz,Ronald K.. |
| ABSTRACT Lophiosilurus alexandri is a carnivorous freshwater fish endemic of São Francisco basin and an endangered species. In this study, we analysed the chemical composition (moisture, protein, ash and lipid), fatty acid profile, and nutritional quality (atherogenic index, thrombogenecity index, ratio between hypocholesterolemic and hypercholesterolemic fatty acids and ω6/ω3 = ratio) of L. alexandri in lotic (river), lentic (hydroelectric dams) environments, under natural fed, and in laboratory controlled conditions fed with commercial diets. Cultured and lentic fish had significantly higher lipid levels (1.5 and 1.9- fold, respectively) than lotic fish. Lentic L. alexandri had significantly higher eicosapentaenoic acid (EPA) levels (4×) than cultured or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Feeding; Lipids; Pacamã; Ω3. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500211 |
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| Ribeiro,Paula A.P.; Miranda-Filho,Kleber C.; Melo,Daniela C. de; Luz,Ronald K.. |
| In aquaculture, activities with anesthetic compounds are usually used in order to ensure the welfare of farmed fish, allowing handling out of water with decreased trauma by stress. Presently, there is no information about anesthetic action of eugenol in early life stages of Nile tilapia (Oreochromis niloticus). The objective of this study was to evaluate different concentrations of eugenol for larvae and juveniles of Nile tilapia. Sixty animals were used for each group of weight, group I = 0.02 g; group II = 0.08 g; group III = 0.22 g; group IV = 2.62 g; and group V = 11.64 g. The eugenol concentrations tested were 50, 75, 100, 125, 150 and 175 mg L-1. No mortality was reported during the tests with eugenol. Tilapia larvae with 0.02 g and juveniles around... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anesthesia; Cichlid; Handling; Welfare. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100529 |
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